"Effect of Amine Structure on Photoreduction of Hydrogen Abstraction In" by Kalyanaraman Viswanathan, Charles Hoyle et al.
 

Effect of Amine Structure on Photoreduction of Hydrogen Abstraction Initiators

Document Type

Article

Publication Date

10-8-2002

Department

Polymers and High Performance Materials

Abstract

The photocuring rates of acrylate monomers initiated by abstraction type photoinitiators (benzophonone, isopropylthioxanthone, and IV-methylmaleimide) and a series of structurally different tertiary amine combinations are reported. Photo-DSC results confirm that transferable hydrogens on tertiary amines are essential for efficient acrylate polymerization. Laser flash photolysis experiments were carried out to define the electron/proton transfer reactions which occur between excited triplet states of the photoinitiators and tertiary amines. In the case of N-methylmaleimide, an intermediate radical anion was detected for amines with no readily transferable proton. This confirms that the photoreduction of the triplet state of N-substituted maleimides by tertiary amines occurs by an electron/proton transfer when the tertiary amine electron donor has a transferable proton.

Publication Title

Macromolecules

Volume

35

Issue

21

First Page

7963

Last Page

7967

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